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<div class="title">nrf51/Board/nrf6310/timer_example/main.c</div>  </div>
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<a href="nrf6310_2timer__example_2main_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00027"></a>00027 <span class="preprocessor">#include &lt;stdbool.h&gt;</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include &lt;stdint.h&gt;</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include &quot;nrf.h&quot;</span>
<a name="l00030"></a>00030 <span class="preprocessor">#include &quot;nrf_gpio.h&quot;</span>
<a name="l00031"></a>00031 
<a name="l00032"></a><a class="code" href="group__nrf__dev__timer__example.html#gaf9da5a2609c3a2f509cb33350d705953">00032</a> <span class="preprocessor">#define TIMER_DELAY_MS               (100UL)   </span>
<a name="l00033"></a><a class="code" href="group__nrf__dev__timer__example.html#gac1e2877f05e3f67a8ff95c7f4d0ac1d6">00033</a> <span class="preprocessor">#define GPIO_TOGGLE_PIN              (8)       </span>
<a name="l00038"></a><a class="code" href="group__nrf__dev__timer__example.html#ga764f517e2e45ad48bcd8b88590ab5276">00038</a> <span class="preprocessor">typedef enum</span>
<a name="l00039"></a>00039 <span class="preprocessor"></span>{
<a name="l00040"></a><a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276aa73b8bf071cada8f26f46555396534e0">00040</a>   <a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276aa73b8bf071cada8f26f46555396534e0">TIMER0</a> = 0,  
<a name="l00041"></a><a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276a78900d10bb4d349f1403fbd090e66cd6">00041</a>   <a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276a78900d10bb4d349f1403fbd090e66cd6">TIMER1</a>,      
<a name="l00042"></a><a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276a9fdce91e07a880b720491a6667122d5d">00042</a>   <a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276a9fdce91e07a880b720491a6667122d5d">TIMER2</a>       
<a name="l00043"></a>00043 } <a class="code" href="group__nrf__dev__timer__example.html#ga764f517e2e45ad48bcd8b88590ab5276">timer_t</a>;
<a name="l00044"></a>00044 
<a name="l00045"></a>00045 <span class="keyword">static</span> <span class="keywordtype">void</span> nrf_timer_delay_ms(<a class="code" href="group__nrf__dev__timer__example.html#ga764f517e2e45ad48bcd8b88590ab5276">timer_t</a> timer, uint_fast16_t <span class="keyword">volatile</span> number_of_ms);
<a name="l00046"></a>00046 
<a name="l00052"></a><a class="code" href="group__nrf__dev__timer__example.html#ga840291bc02cba5474a4cb46a9b9566fe">00052</a> <span class="keywordtype">int</span> <a class="code" href="group__gpio__example.html#ga840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>)
<a name="l00053"></a>00053 {
<a name="l00054"></a>00054   <span class="comment">// Configure pins 8 to 15 as outputs</span>
<a name="l00055"></a>00055   <a class="code" href="group__nrf__gpio.html#ga0271806dc37bffea02d199474d526a35" title="Configure given GPIO pin number as output with given initial value set, hiding inner details...">nrf_gpio_cfg_output</a>(<a class="code" href="group__nrf__dev__timer__example.html#gac1e2877f05e3f67a8ff95c7f4d0ac1d6">GPIO_TOGGLE_PIN</a>);
<a name="l00056"></a>00056 
<a name="l00057"></a>00057   <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00058"></a>00058   {
<a name="l00059"></a>00059     <a class="code" href="group__nrf__gpio.html#ga5c8310a3b7a81cc4a267844c81769a40" title="Toggle GPIO pin.">nrf_gpio_pin_toggle</a>(<a class="code" href="group__nrf__dev__timer__example.html#gac1e2877f05e3f67a8ff95c7f4d0ac1d6">GPIO_TOGGLE_PIN</a>);
<a name="l00060"></a>00060     <span class="comment">// use hardware timer0 to generate 100ms delay</span>
<a name="l00061"></a>00061     nrf_timer_delay_ms(<a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276aa73b8bf071cada8f26f46555396534e0">TIMER0</a>, <a class="code" href="group__nrf__dev__timer__example.html#gaf9da5a2609c3a2f509cb33350d705953">TIMER_DELAY_MS</a>);
<a name="l00062"></a>00062 
<a name="l00063"></a>00063     <a class="code" href="group__nrf__gpio.html#ga5c8310a3b7a81cc4a267844c81769a40" title="Toggle GPIO pin.">nrf_gpio_pin_toggle</a>(<a class="code" href="group__nrf__dev__timer__example.html#gac1e2877f05e3f67a8ff95c7f4d0ac1d6">GPIO_TOGGLE_PIN</a>);
<a name="l00064"></a>00064     <span class="comment">// use hardware timer1 to generate 100ms delay</span>
<a name="l00065"></a>00065     nrf_timer_delay_ms(<a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276a78900d10bb4d349f1403fbd090e66cd6">TIMER1</a>, <a class="code" href="group__nrf__dev__timer__example.html#gaf9da5a2609c3a2f509cb33350d705953">TIMER_DELAY_MS</a>);
<a name="l00066"></a>00066 
<a name="l00067"></a>00067     <a class="code" href="group__nrf__gpio.html#ga5c8310a3b7a81cc4a267844c81769a40" title="Toggle GPIO pin.">nrf_gpio_pin_toggle</a>(<a class="code" href="group__nrf__dev__timer__example.html#gac1e2877f05e3f67a8ff95c7f4d0ac1d6">GPIO_TOGGLE_PIN</a>);
<a name="l00068"></a>00068     <span class="comment">// use hardware timer2 to generate 100ms delay</span>
<a name="l00069"></a>00069     nrf_timer_delay_ms(<a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276a9fdce91e07a880b720491a6667122d5d">TIMER2</a>, <a class="code" href="group__nrf__dev__timer__example.html#gaf9da5a2609c3a2f509cb33350d705953">TIMER_DELAY_MS</a>);
<a name="l00070"></a>00070   }
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072 
<a name="l00073"></a>00073 <span class="keyword">static</span> <span class="keyword">volatile</span> NRF_TIMER_Type * timer_init(<a class="code" href="group__nrf__dev__timer__example.html#ga764f517e2e45ad48bcd8b88590ab5276">timer_t</a> timer)
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075   <span class="keyword">volatile</span> NRF_TIMER_Type * p_timer;
<a name="l00076"></a>00076 
<a name="l00077"></a>00077   <span class="comment">/* Start 16 MHz crystal oscillator */</span>
<a name="l00078"></a>00078   NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED = 0;
<a name="l00079"></a>00079   NRF_CLOCK-&gt;TASKS_HFCLKSTART = 1;
<a name="l00080"></a>00080 
<a name="l00081"></a>00081   <span class="comment">/* Wait for the external oscillator to start up */</span>
<a name="l00082"></a>00082   <span class="keywordflow">while</span> (NRF_CLOCK-&gt;EVENTS_HFCLKSTARTED == 0) 
<a name="l00083"></a>00083   {
<a name="l00084"></a>00084   }
<a name="l00085"></a>00085 
<a name="l00086"></a>00086   <span class="keywordflow">switch</span> (timer)
<a name="l00087"></a>00087   {
<a name="l00088"></a>00088     <span class="keywordflow">case</span> <a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276aa73b8bf071cada8f26f46555396534e0">TIMER0</a>:
<a name="l00089"></a>00089       p_timer = NRF_TIMER0;
<a name="l00090"></a>00090       <span class="comment">// Power on the TIMER0 peripheral</span>
<a name="l00091"></a>00091       NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER0_Power &lt;&lt; POWER_PERPOWER_TIMER0_Pos);
<a name="l00092"></a>00092 
<a name="l00093"></a>00093       <span class="comment">// Wait for the power up</span>
<a name="l00094"></a>00094       <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER0_Msk) != (POWER_PERRDY_TIMER0_Ready &lt;&lt; POWER_PERRDY_TIMER0_Pos))
<a name="l00095"></a>00095       {
<a name="l00096"></a>00096       }
<a name="l00097"></a>00097       <span class="keywordflow">break</span>;
<a name="l00098"></a>00098 
<a name="l00099"></a>00099     <span class="keywordflow">case</span> <a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276a78900d10bb4d349f1403fbd090e66cd6">TIMER1</a>:
<a name="l00100"></a>00100       p_timer = NRF_TIMER1;
<a name="l00101"></a>00101       <span class="comment">// Power on the TIMER1 peripheral</span>
<a name="l00102"></a>00102       NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER1_Power &lt;&lt; POWER_PERPOWER_TIMER1_Pos);
<a name="l00103"></a>00103 
<a name="l00104"></a>00104       <span class="comment">// Wait for the power up</span>
<a name="l00105"></a>00105       <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER1_Msk) != (POWER_PERRDY_TIMER1_Ready &lt;&lt; POWER_PERRDY_TIMER1_Pos))
<a name="l00106"></a>00106       {
<a name="l00107"></a>00107       }
<a name="l00108"></a>00108       <span class="keywordflow">break</span>;
<a name="l00109"></a>00109 
<a name="l00110"></a>00110     <span class="keywordflow">case</span> <a class="code" href="group__nrf__dev__timer__example.html#gga764f517e2e45ad48bcd8b88590ab5276a9fdce91e07a880b720491a6667122d5d">TIMER2</a>:
<a name="l00111"></a>00111       p_timer = NRF_TIMER2;
<a name="l00112"></a>00112       <span class="comment">// Power on the TIMER2 peripheral</span>
<a name="l00113"></a>00113       NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER2_Power &lt;&lt; POWER_PERPOWER_TIMER2_Pos);
<a name="l00114"></a>00114 
<a name="l00115"></a>00115       <span class="comment">// Wait for the power up</span>
<a name="l00116"></a>00116       <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER2_Msk) != (POWER_PERRDY_TIMER2_Ready &lt;&lt; POWER_PERRDY_TIMER2_Pos))
<a name="l00117"></a>00117       {
<a name="l00118"></a>00118       }
<a name="l00119"></a>00119       <span class="keywordflow">break</span>;
<a name="l00120"></a>00120 
<a name="l00121"></a>00121     <span class="keywordflow">default</span>:
<a name="l00122"></a>00122       p_timer = 0;
<a name="l00123"></a>00123       <span class="keywordflow">break</span>;
<a name="l00124"></a>00124   }
<a name="l00125"></a>00125 
<a name="l00126"></a>00126   <span class="keywordflow">return</span> p_timer;
<a name="l00127"></a>00127 }
<a name="l00128"></a>00128 
<a name="l00135"></a>00135 <span class="keyword">static</span> <span class="keywordtype">void</span> nrf_timer_delay_ms(<a class="code" href="group__nrf__dev__timer__example.html#ga764f517e2e45ad48bcd8b88590ab5276">timer_t</a> timer, uint_fast16_t <span class="keyword">volatile</span> number_of_ms)
<a name="l00136"></a>00136 {
<a name="l00137"></a>00137   <span class="keyword">volatile</span> NRF_TIMER_Type * p_timer = timer_init(timer);
<a name="l00138"></a>00138 
<a name="l00139"></a>00139   <span class="keywordflow">if</span> (p_timer == 0) <span class="keywordflow">while</span>(<span class="keyword">true</span>) {}
<a name="l00140"></a>00140 
<a name="l00141"></a>00141   p_timer-&gt;MODE = TIMER_MODE_MODE_Timer;  <span class="comment">// Set the timer in Timer Mode</span>
<a name="l00142"></a>00142   p_timer-&gt;PRESCALER = 9;                 <span class="comment">// Prescaler 9 produces 31250 Hz timer frequency =&gt; 1 tick = 32 us</span>
<a name="l00143"></a>00143   p_timer-&gt;TASKS_CLEAR = 1;               <span class="comment">// clear the task first to be usable for later</span>
<a name="l00144"></a>00144   <span class="comment">// With 32 us ticks, we need to multiply by 31.25 to get milliseconds</span>
<a name="l00145"></a>00145   p_timer-&gt;CC[0] = number_of_ms * 31;
<a name="l00146"></a>00146   p_timer-&gt;CC[0] += number_of_ms / 4; 
<a name="l00147"></a>00147   p_timer-&gt;TASKS_START = 1;               <span class="comment">// Start clocks</span>
<a name="l00148"></a>00148 
<a name="l00149"></a>00149   <span class="keywordflow">while</span> (p_timer-&gt;EVENTS_COMPARE[0] == 0)
<a name="l00150"></a>00150   {
<a name="l00151"></a>00151   }
<a name="l00152"></a>00152 
<a name="l00153"></a>00153   p_timer-&gt;EVENTS_COMPARE[0] = 0;
<a name="l00154"></a>00154   p_timer-&gt;TASKS_STOP = 1;                <span class="comment">// Stop clocks</span>
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 
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